Climate

The Cool Cell works with nature. It performs best in dry clear climates where night skies are cold, but it still works well in more humid regions.

SUMMER DAY COOLING During hot summer days, water in the patented Zomeworks system absorbs heat from batteries, equipment, and solar gain.
SUMMER NIGHT COOLING During summer nights, warm water rises to the lid, radiates its heat to the cold night sky, and sinks back into the enclosure. This thermo-siphon action removes heat from the system throughout the night.
WINTER / NIGHT FREEZE PROTECTION During very cold weather, water in the tank freezes, releasing 1 kWh of heat into the enclosure for each 3 gallons of water in the system. For additional protection in extremely cold climates, an optional variable output heater can be used to reverse this phase change, extending the freeze protection cycle indefinitely

Temperature Control

Higher Heat Loads

Typically, the average battery Cool Cell temperature will be the lower ¼ point of the daily low and high temperature. If the daily low is 70 degrees and the high is 90, the average cool cell temperature will be 75 degrees. All battery Cool Cells are fitted with a hydrogen vent for safety. Electronic equipment Cool Cells are designed for higher heat loads and typically run warmer. It’s designed for the climate where it’s to be installed considering the heat output of the internal electronics, the allowable upper temperature limit and the physical size of the equipment.

How Cooling Works

The passive cooling system consists of a water filled plenum radiator fitted to the lid of the enclosure. The radiator is connected by hoses to a cooling reservoir below in the insulated cabinet. The reservoir absorbs heat from the batteries or electronics which moderates internal heat rise. At night the external radiator and water cools and falls to the reservoir below. Simultaneously, warmer water from the reservoir rises up to the radiator. Convective circulation continues throughout the night, cooling the entire system. In the morning circulation stops when the radiators warm. The cooled water is trapped below and ready to accept another round of heat. The cool cell is recharged every 24 hours.

Cool Cells in Cold Climates

The cooling system is freeze tolerant. During prolonged freezing weather, as the water in the reservoir freezes, the heat of fusion as ice forms will guard the Cool Cell and its contents from extremely cold conditions. Auxiliary electric heaters are recommended and are available for cold climates.